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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622cc0563aca681c86e35c910d721d15bd8a35f73c42d3618eecc886a075854a' 
  AND token = 'mZXkaxRk1RlQKJADNfUKcNPPMPf08ox5Mb7V55WCiu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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