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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9cb2e5eaf0cbba203bb26e4e812f37f0e2931d80a7aa91efc094861d1f753a' 
  AND token = '1uDrQYr8iZ4O++SUFLUTu6fJBSmtWBdFczSZTeCyhjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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