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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bef4ce214f5f7c343a655ca3c0aef0b032a175290eaa8c9ae45434efbea2cf5' 
  AND token = 'nZE+cFvPe1wQM4D41gXlJTVYPl2GepqngZmTW+0Tchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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