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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c5026dc088fdc9fc3e2a50bf8e67da47284abdf82ed10766af46695fd4a33f' 
  AND token = 'TUjv27jceMYTiWNAhsd0Tl1EbW0jcS+yXC67Ngf1rPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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