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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb07d674b185f402f1b6452f521d32bc82814a68a1fd17f57b8b76be1b31996d' 
  AND token = 'OEiJ1C3YXcZk9cib2Z12O3jy2vup3boqWGNxJ1JpBXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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