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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472a3f5478344a610c6e1d98b80016ea78c20f31de0d539e67abe243b3a27d02' 
  AND token = 'lPb1FqeHLOlUOHthrWvt28l60iUiYNKLQZ9xFD8ouhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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