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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523b7db38e34e0c137f8f618e6c6d8ad938a526db250d797b01f773ec2f3e15e' 
  AND token = 'bIKaPxy49irKeD/HAdG1W5uToSuD/NFEFHXCMtUEiKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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