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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065ada26764600107c5a681f08e9afa048942c6e995886f2690b3faf5ea7cd3b' 
  AND token = 'O1ph4403Dyvfp73QKeJ+Oi5fM6Hl1iwhmqh3ScIwyRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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