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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7911c7980263fe19a35cf97f38c9a8f7bd93f2f2f5e06d5dd9cc6f0895330ee' 
  AND token = 'P4a8ca31yyVX/iQkq280Cw3h0C8P9kTSMHCwS78na0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}