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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa87924a9606de89d8a11b9e23485244a18bb5988f5c3df0f9cff428622ec6df' 
  AND token = '/kP5A9lb/goqXsRlgxy3jjAIYa+f1eRnkkTzGlFWQcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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