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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8e5c49793352070ce3e791747dfeda593453b2d38061fb669eabf2d516097b' 
  AND token = 'UaxqBPlKvRrFLFF3yXOWEpJLIP7MjcLXTTO9FUlKFu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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