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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f7e7f9f34e9b5e3328dfa75038bc1e79f746f823c8b59a3c760e74c46d2deb' 
  AND token = '5AeoRVPyQcpwQrRqreJrBv2gSdAbl730/mNxpL9ozBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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