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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23511ab2b277b401ce487670ba57af43f3b040482b52b0ca8b546b8c971d268f' 
  AND token = 'iJ0eU25ONToOOZMVJtIkeT5kCtnavMM/rRBhcclH/rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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