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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0496c9fbff65c1a6cb23223f3f8b438a4d1fc60b0d7dcb79bebec81f3dcfb5c8' 
  AND token = 'bJXXn0xI8gAlRassplmITIIsIPfnhUh0/XPhAsy9ccE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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