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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2df64fe09bb24e1a51a4868799bf5a25511a183b828ddfff952756e79d9357' 
  AND token = 'IjKXWSnG5kYps42rUfY1DC7cvj0BM7OMin4G32t8q4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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