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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c4841982050c20e9c76bd63dc013bff978cc65b759d881496829f7eca36920' 
  AND token = '/qx22W38eJWaeT/BzREr1WN0xsHcgdOPsPZw5J8bFUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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