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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da4d77820b5c4234de1ca5dee2d347825c851075892caeb716e8231c0265fee' 
  AND token = 'uNcWpgeOi5N1EU5qXrQgWneTviWOfkMoEelpnqam1EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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