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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf0b9cd50f5e264779e1f7d3089b2d09de41a19b4326e3addfd2e5f54c76acb' 
  AND token = '09cHpk9YiXJFotTsLWMDRXxRL5bfCLeLtlW3XD8USYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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