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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a62df81660245b5ab244c16bb8666a4fc1131ddff3cc37b60d4d73959bc97c1' 
  AND token = 'BwPT6YyuYDs0QPvWrztzvU4iQJdoc4epQK29EPs7A1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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