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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0407b0634acc68bdfe4116587bffeef0267900284aecdfd7ce196292d10a121a' 
  AND token = 'uTJmQKGiwNiiw0Opj0FkRdWQpiB6zvHKhSuWqxQ3pus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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