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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c05a92efcc8c35c712218e2ab7ee5038a57c912498a5a410d7705b7b8bc7ba4' 
  AND token = 'dmkTROL8otM/uSu9rmRh1IAqb9cBnmULS4dIKuy2Y+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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