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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa067a4c3a04a04a24a1420f95881b465b69f60f3d050ef9910c3d1baf898a0b' 
  AND token = '59jhu92GyLLJa57pgMq50NyC8DD3bsqoPBZjTQzGK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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