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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5b7f0f7f27c5db317b647d6bee6e4135e612460894eab74f9cce5c4fa47410' 
  AND token = 'AhfbPlFPGgzIv3EpCJ8yNxFSRfOZk1YKhVEzS3689MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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