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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88f7bcd5e798d798a654753a201f999f9996751b4fff0464dd6d491d78135bf' 
  AND token = 'r4xE2woOrZv4fdWJt01QBVnA6WGLwwtkxH58m1UbHck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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