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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd349514974f7e0414ff24d30c1bd751c56ed93b77be9e02984df855356bdb55e' 
  AND token = 'x/d1ZpoEJhphrCAKgu6U/qDvNNW2X7eZiJWEVl7P0s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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