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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44147b00c78386c87a24e4eb2782a7e50409a9da8816bcbd8dfe9b95f742ad27' 
  AND token = 'oovLpb1q48+qg9EjJbPFGCYssrZQvkNssWoLBrJxUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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