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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201a2d3b6076aaa5464fb253863aa32a6c4181543ec3caa1d3b0e5e61692ae6e' 
  AND token = '5Ttta0esbpNbLBr21vyMNLBFY0hi09adzRk7tr6Mlvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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