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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789131ce1159ab8bd3520868d65e4ded3f89ee7dd2ddee7a932b1371bf01db41' 
  AND token = 'MK2bFE5uux2ZzGYvYFN2K4B8figMya1ohAj7CwDpDU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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