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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528147a7c5ce79b87d150f93868fd11ed70c5350e3e1b2ea662d86e5931cbb3c' 
  AND token = 'Fiwhgdjs8aLJfxH7rNquxytDhQ2Kyiq/ePXlemTY9Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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