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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb138cd89f8568b70611b8095fbfe6756bc674d39bd08181e5577ec39c67c4dc' 
  AND token = '6+w+fdyJHH6brwtw2uGtdQbW9JkEymHR5w4KLXF95+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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