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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f053115a0d46641ada093aabe67149b99bdbf68c35b7a9b5d94e9fa7428a1d' 
  AND token = 'k5QUgZom6lXpfipdWWeUmQgh6b3gmcBw6Hng7lfFlro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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