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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84dccee7bdd6c9decf7d65f0ff290a43df88a46c72a1d16cfc1be5301a823b36' 
  AND token = 'vBx0YXox/tB7PEEUy1151jwr+qCCP3GOHKxc/VI9M4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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