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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30916e9f3b9b19f64c296b64f524a4ac0fc73c1c378029fcf6c1853f5ef1430' 
  AND token = 'fI+dqdbxAG0IxyICKZEjBXez4tUpJ8xLtp9hjKhJoS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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