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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1879378330d1d9685b43fbafe453794ad9663bd8b5f2d7c0d37f63f832fb751e' 
  AND token = 'SaBWjlaRC0Suo0si07y3wA1XSJSLnTn3O0w8liBilQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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