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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a283a9fc2af3c8a6642ffa87ebb697aeb9b81deb8ea36e2be2a60a380d9147af' 
  AND token = 'Arw6FcilqfdtlK4zSX7wocw1ZNCzS1PmQCc0TItv/uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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