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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf1a597e15e82e36c279a73ad878275fc052ed2ec78517b6909553f094ad463' 
  AND token = '/OPJ9WELXRImpot7p/qtDRPMMiRMzjiOQf3CrYhmTCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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