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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29e9b6afab72ff97da05b602dfc2814c9750b12caf7d8138d7ae8ff5718ef3c' 
  AND token = '1YIPwCWeQ3i5OLJiHy+agVN5s2d1MmVpjEglbS3lVns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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