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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9f1672d10fcc5c33b65639a0bb827a05a1f3008c72246c9b980179471a6a36' 
  AND token = 'OfroQ6Aob616x1dN9l0H1m1Gr0YDJ8EDl3sgswGoUok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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