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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a8708b832f37dc5057d8e307586cbc76b7e5896a0075aa50a1d7d45f69485a' 
  AND token = 'mE8KayJDbsn12yfrgF5fFcKlu2m/PYWXWIfQ5I3G44g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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