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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb09121dc6a1102a3bccf54760109cfaa31c979c3b0f74129178eee86e1d0f02' 
  AND token = 'g38CxTtkRzCUMmIbD/Ss43pjty1e823Te3PNgwYB8aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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