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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbe15df79cc5fff34cfe590a0f4f3d6f8c49e95b6aa93e2e82b20aa1a9a3285' 
  AND token = 'AZBYbNVCprJ1v0N12unpVMxpU3FnXfrsCIhqhP8MM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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