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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92910e34f452290e5d857eb5df7736c948ec433f570c1f59c586a0abdb2b2e7a' 
  AND token = 'a6jHdDrt2SjPKM/oPVYB2pxN5A6D76Q021Gy8KXN+dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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