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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb78210f07092efc1b6483a3c90f7fa1c8693a5a20f8c715e3769136c25f960b' 
  AND token = 'iD1COgJlu76l30ystQxBsZZAWNMikuZLZYA2rVZl+KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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