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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfd8f2787cdfcec6d8d53cadf5130e1caf90e687b96da5faf01145286781cd4' 
  AND token = 'niadhKx47JWInXWiXiz5SaJzr5Rs/wY7//bv1gHfZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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