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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0df33655cbc5ae47a9566951bf5c6a12f00c6fb6cdea54c7e8b5ec7899ec2f0' 
  AND token = 'mQdRYvGB3WzWW9JU45bJpF5qrYmIeciwW1emENQMeg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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