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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678e638f6fb8004291826e8d695570ee6a2f04eb81946def0a4e0cec188f0ca7' 
  AND token = 'cBdDdCAS2RAxFSsBJ897wjjcW6P0sMBEqNERYNPvm/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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