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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ca910c4060bdffe09ab8c430ee38f8ee0fd37a6a972f0db8a48fa39d253d6' 
  AND token = 'uCxRxLh64B+CSwJToK5Ac9MnsIy1GF93C4Jaq11XJNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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