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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02ce803c17f2fcd348a768e4f7c27b8ace7fcc0ffba813ee398d19ec6d3317f' 
  AND token = 'ec0p4UwKHAnkd7yiXZGNXcawfnT6aHGug/GBnGtuCs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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