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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cb066ad1657c93a48b3e55c22c24e20483a970f5f79ef3b51add55fbd405c7' 
  AND token = 'AWE629dEfa1ez71CPCkoo7aKDeZpmUFNqFg2dzmINFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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