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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdec66b662f25655a4321f2c6293a234c4c92efe9a80f26e027fa0a8cbfd699' 
  AND token = 'SpGxkmzFOaKAWUkMHZYW5YLJlAZL2IzR3A2OoAr5j5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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