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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83200586259261583e4e51eafad2f36a6f7a28a2a1c8e4ac30aeb2ea0bf52f07' 
  AND token = 'Fg3NSqrlL9CpgILGZe7OpK9Q+N8SEaTlsg44FO6xuMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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