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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fcb1b90ccde131aaeab83b4ec22c98c053c3588d1255f0f086b479fcc5cc72' 
  AND token = 'NKnyVd+L8ZTaRa+Wp/dB08m0op8p6RF916j4H9VlOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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