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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9baa34b7ec068f082f7a770231ba558621d0893e3d04279c1109169e6103f44' 
  AND token = 'z4z0jU9sA0OsBGEBBm9jANMIdoHofoPBwChc/ZI5Wcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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