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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4088d68f2e03b65e988954c591a63644820da0d842cb18b09c828d5331c6bf89' 
  AND token = 'uB5iDqIaq8alKsCTGQseHCgVlONSVCMDi2mQvhVXo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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