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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f99e7b2054e4368647150f42d797e99eec51c56a063dac67f7f20a0cc0de91' 
  AND token = 'DOzInh34EmkwSiFJapxSZOCYwE37MrmZ3zyk9O4X8iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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