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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be427e2aa399b121c128c59f05ffab1e476a329045221014c4304b8c28c98b0c' 
  AND token = '92Ncvli1aP+UFjSG6O1Q8GnTYV643LotrEblBLGTBhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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