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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d855f9a5fae61d0abd61e50e7f4d854ffb7ce31db7d804a17cfd4b848c64fae' 
  AND token = '53NJgvF0abo3E8NY3HQ1EgaRSRpDZN1rf13od/169XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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