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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292e676048a6e7848b66a371fe44bdd1e451cfafcf98e4e84aa9576441e15eef' 
  AND token = 'Y29dBZqfS9Fr35+aLAjjIWQ5aRebIHoUOBE8y0LdnF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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