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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c010a231405fa3d8b6aade07a84d0778b3ff562a6b6514bcc070d60d41f3f7' 
  AND token = 'VyqsOvrxubCfaflZzPATpf+LB6uztkLv9hv1zj7IkWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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