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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6098c5d1a1ef79b34559c1272db6ac77f9be958885f0762d2ff0d04e84b1df93' 
  AND token = 'IZY3fTNigNKkGoVycuj/fqgFst7mIb6BiEgsVioVjI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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